The White House has authorized an expansion of the C.I.A.'s drone program in Pakistan's lawless tribal areas. More C.I.A. drone attacks have been conducted under President Obama than under President George W. Bush. The political consensus in support of the drone program ... and its secrecy have obscured just how radical it is. For the first time in history, a civilian intelligence agency is using robots to carry out a military mission, selecting people for killing in a country where the United States is not officially at war. The drone warfare pioneered by the C.I.A. in Pakistan and the Air Force in Iraq and Afghanistan is the leading edge of a wave of push-button combat that will raise legal, moral and political questions around the world, said P. W. Singer, a scholar at the Brookings Institution and author of the book Wired for War: The Robotics Revolution and Conflict in the 21st Century. So far, only the United States and Israel have used the planes for strikes, but that number will grow. It is impossible to judge whether the program violates international law without knowing whether Pakistan permits the incursions, how targets are selected and what is done to minimize civilian casualties.